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Borrowings - Summary of Exposure Related To Unconsolidated VIEs (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Estimated Fair Value | $ 2,022,605 |  | $ 2,411,622 |  |  |
Total Exposure | 91,959 | $ 49,479 | 112,962 | $ 113,847 | $ 62,600 | $ 124,924
Variable Interest Entity, Not Primary Beneficiary | Private Education Loan term securitizations |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Estimated Fair Value | 591,155 |  | 423,327 |  |  |
Equity Interests | 54,840 |  | 54,481 |  |  |
Total Exposure | $ 645,995 |  | $ 477,808 |  |  |

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